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All Journal IJCCS (Indonesian Journal of Computing and Cybernetics Systems) SMATIKA JURNAL NASIONAL TEKNIK ELEKTRO PROtek : Jurnal Ilmiah Teknik Elektro JOURNAL OF INFORMATICS AND TELECOMMUNICATION ENGINEERING JURNAL MEDIA INFORMATIKA BUDIDARMA Patria Artha Technological Journal JURIKOM (Jurnal Riset Komputer) Jurdimas (Jurnal Pengabdian Kepada Masyarakat) Royal EDUMATIC: Jurnal Pendidikan Informatika Building of Informatics, Technology and Science Jurnal Informatika dan Rekayasa Elektronik Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Jurnal E-Komtek Jurnal Pengabdian Masyarakat Multidisiplin Jurasik (Jurnal Riset Sistem Informasi dan Teknik Informatika) Jurnal Digit : Digital of Information Technology INSERT: Information System and Emerging Technology Journal Aptekmas : Jurnal Pengabdian Kepada Masyarakat Joong-Ki : Jurnal Pengabdian Masyarakat Joong-Ki Jurnal Ecotipe (Electronic, Control, Telecommunication, Information, and Power Engineering) Joong-Ki INOVTEK Polbeng - Seri Informatika Smatika Jurnal : STIKI Informatika Jurnal
Mohammad Fadhli
Jurusan Teknik Elektro. Politeknik Negeri Sriwijaya
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Yagi-Uda Antennas for Private LTE Band 3 FDD: Simulation, Fabrication, and Measurement Muhammad Rizko Justiano; Aryanti Aryanti; Mohammad Fadhli
Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Vol 8, No 2 (2026): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v8i2.4168

Abstract

Private LTE Band 3 Frequency Division Duplex (FDD) systems require dedicated uplink and downlink antennas to improve channel isolation and communication reliability. However, experimentally validated split-frequency Yagi-Uda antennas for Software Defined Radio (SDR)-based base stations remain limited. This study presents the design, simulation, fabrication, and experimental validation of two four-element Yagi-Uda antennas operating at 1.840 GHz for downlink (DL) and 1.750 GHz for uplink (UL). Each antenna consists of one reflector, one driven element, and two directors fabricated from 6 mm diameter aluminum rods. The antenna dimensions were optimized using the Trust Region Framework in CST Studio Suite 2024 to achieve optimal impedance matching. Simulation results produced S11 values of −35.33 dB (DL) and −30.76 dB (UL), VSWR values of 1.035 and 1.059, and forward gains of 9.10 dBi and 8.38 dBi, respectively. Measurements using a NanoVNA over the 1.4–2.1 GHz frequency range yielded S11 values of −18.98 dB (DL) and −26.92 dB (UL), with corresponding VSWR values of 1.253 and 1.094. The measured resonant frequencies closely agreed with the simulation results, with a maximum deviation of only 1 MHz. The novelty of this work lies in the experimental validation of a low-cost, split-frequency, four-element aluminum-rod Yagi-Uda antenna pair that operates without an external impedance-matching network. These results demonstrate the suitability of the proposed antennas for SDR-based Private LTE Band 3 base station applications.
AVX2 SIMD Optimization for DSP Load and QoS in a srsRAN-Based Private LTE Network Muhammad Arcy Alfaathir; Sopian Soim; Mohammad Fadhli; Achmad Aflah Jamazy
Aviation Electronics, Information Technology, Telecommunications, Electricals, and Controls (AVITEC) Vol 8, No 2 (2026): August
Publisher : Institut Teknologi Dirgantara Adisutjipto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.28989/avitec.v8i2.4147

Abstract

Private 4G LTE networks built on open-source platforms provide cost-effective localized connectivity. However, executing baseband Digital Signal Processing (DSP) imposes a massive computational burden on general-purpose CPUs. This study evaluates the correlation between DSP load and end-to-end Quality of Service (QoS) in a USRP B210-based Private 4G LTE prototype using srsRAN and Open5GS. To prevent CPU saturation, Advanced Vector Extensions 2 (AVX2) SIMD instructions and CPU core affinity were applied. The experimental design evaluated the system using two concurrent User Equipment (UEs) under Line-of-Sight (LOS) outdoor conditions. Compared to a non-optimized baseline, the AVX2 optimization successfully stabilized the host processor at a 60.8% peak load and achieved a downlink throughput of 35.3 Mbps without radio underflows. However, multiplexing complex baseband signals under heavy concurrent traffic severely congested the OS-level queues. This caused severe bufferbloat, escalating the average end-to-end latency to 2021 ms compared to its idle state. These findings demonstrate that while AVX2 optimization resolves the CPU bottleneck, software-induced bufferbloat remains the primary limitation in SDR deployments.
Co-Authors A Rahman Achmad Aflah Jamazy Ade Silvia Handayani Ahmad Taqwa Ahmad Taqwa Anisah Meidella Antoniy Sandi Wardana Aryanti Aryanti Asriyadi Asriyadi Dea Putri Amanda Elmerillia Elmerillia Elsa Sanjaya Putri Fahreza Pradana Fistania Ade Putri Maharani Gita Affrylia Hj. Lindawati Irma Salamah Irma Salamah Irma Salamah Lanang, Jabbar Kala Lindawati Lindawati Lindawati Lindawati Lindawati Lindawati Lindawati M. Redho Ali Said Martinus Mujur Rose Mega Muliawati Muhammad Arcy Alfaathir Muhammad Gian Azzra Ramadhan Muhammad Juan Farza Rafly Alganiyu Muhammad Rizko Justiano Nur Hopipah Raden Kusumanto RD Kusumanto Salwa Kamila Salwa Kamila Sopian Soim, Sopian Suroso Tarnita Rizky Prihandhita Tri Binarko Utomo Trisa Azahra Wynda Anggraeni Iskandar Wynda Anggraeni Iskandar